macOS: Emit LoopDestroyed on CMD+Q (#2073)

override applicationWillTerminate:

Co-authored-by: Mads Marquart <mads@marquart.dk>

CHANGELOG.md

@@ -8,6 +8,7 @@ And please only add new entries to the top of this list, right below the `# Unre
 
 # Unreleased
 
+- On macOS, Fix emitting `Event::LoopDestroyed` on CMD+Q.
 - On macOS, fixed an issue where having multiple windows would prevent run_return from ever returning.
 - On Wayland, fix bug where the cursor wouldn't hide in GNOME.
 - On macOS, Windows, and Wayland, add `set_cursor_hittest` to let the window ignore mouse events.

src/platform_impl/macos/app_delegate.rs

@@ -34,6 +34,11 @@ pub static APP_DELEGATE_CLASS: Lazy<AppDelegateClass> = Lazy::new(|| unsafe {
         sel!(applicationDidFinishLaunching:),
         did_finish_launching as extern "C" fn(&Object, Sel, id),
     );
+    decl.add_method(
+        sel!(applicationWillTerminate:),
+        will_terminate as extern "C" fn(&Object, Sel, id),
+    );
+
     decl.add_ivar::<*mut c_void>(AUX_DELEGATE_STATE_NAME);
 
     AppDelegateClass(decl.register())
@@ -75,3 +80,10 @@ extern "C" fn did_finish_launching(this: &Object, _: Sel, _: id) {
     trace_scope!("applicationDidFinishLaunching:");
     AppState::launched(this);
 }
+
+extern "C" fn will_terminate(_this: &Object, _: Sel, _: id) {
+    trace!("Triggered `applicationWillTerminate`");
+    // TODO: Notify every window that it will be destroyed, like done in iOS?
+    AppState::exit();
+    trace!("Completed `applicationWillTerminate`");
+}